John O'Sullivan

John O'Sullivan was an Irish journalist and political commentator, best known for coining the term "Manifest Destiny" in the 1840s. This concept expressed the belief that the expansion of the United States across the American continent was both justified and inevitable. O'Sullivan's ideas played a significant role in the broader discussions of American expansionism, influencing public opinion and policy during that era. His writings often reflected the political and social sentiments of his time, contributing to the complex narrative of American history regarding territorial growth and its implications for indigenous peoples and neighboring nations.